I've had good success in using this: https://github.com/sqliteai/sqlite-vector if you want something a bit more "off the shelf" if you are using SQLite.

Ooh that does look nice. However, that license is a deal breaker for me.

Author here... it is free for open-source projects.

What kind of license would you like more?

	▲	simonw 27 minutes ago \| parent [-]
		One that lets me use it in my open source projects without then preventing other people from using my open source projects in their closed source projects. Using your library currently completely disrupts the licensing situation for my own work.